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I sucked down the icy air, but all too soon my lungs grew ragged from the cold. It felt like I was breathing in air from a red-hot furnace. My broken fingers throbbed, but that was the least of my worries. The bulldozer stayed directly behind me. It wouldn't get tired. There was no way I could stay ahead of it, not with all the miles between me and where the Mackenzie entered the Arctic Ocean.